Moreover, while methylamine, dimethylamine, and trimethylamine increase in basicity corresponding to the introduction of successive methyl groups, phenylamine or aniline, diphenylamine, and triphenylamine are in decreasing order of basicity, the salts of diphenylamine being decomposed by water.
Dimethylamine, (CH 3) 2 NH, is found in Peruvian guano.
Trimethylamine, (CH3)3N, is very similar to dimethylamine, and condenses to a liquid which boils at 3.2-3.8° C. It is usually obtained from "vinasses," the residue obtained from the distillation of beet sugar alcohol, and is used in the manufacture of potassium bicarbonate by the Solvay process, since its hydrochloride is much more soluble than potassium carbonate.
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